Improvement in moulds for casting pipe



. been trued in a lathe.

Massese-wt. www@ JACOB EDSON, OF BOSTON, MASSACHUSETTS.

Lette/rs Patent No. 88,020, dated March 23, 1869.

The Schedule rafon'ed to in these Letters Patent and making part of the. same.

To all whom it may concern:

Be it known that I, J ACOB EDSON, of Boston, in the county of Suffolk, and State of Massachusetts, have' invented an Improved Mould forCasting .Seamless Flanged Pipes and Columns; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

'It is well known to those who are familiar with the subject, that in any of the commonY methods of moulding cylinders, the cylinder, when cast, has a sprue, or n, or', as sometimes called, aseam, caused by the shrug ofthe flask; that is, the two parts of' the flask being pinned together, there is a slight motion of one part upon the other, thus allowing the two half impressions' of the pattern to vary slightly from the true relative positions, so that when the article is cast, the parts in .the two divisions of the flask do not unite accurately.

In ordinary work, a slight lateral shrug of the flask will not cause serious injury to the casting, but a longitudinal shrug causes the ends to be uneven, which, in the case of 'a flat-flanged water-pipe, or a supportingcolumn, is avery sen'ous injury; in fact, a flanged waterpipe, or column, is not fit for use until the ends have Again, the pattern from which the cylinder is moulded, may not be pinned togetherv accurately, or in parting the flask, the sand may break away around the pattern, and thus allow sprues, or fins to form. 'lhe object of my invention is to overcome these diliculties.

.To enable others skilled in the art toavail themselves of my invention, I will proceed to describe my method of operation, and the apparatus required.

AIn the drawings- Figure l represents, in perspective, the lower part, a b c, of my flask, drawn in full liues, and the upper part, or cope, a b c', drawn in dotted lines. The core, K L, and the pipe, l?, are' also shown.

Figure 2 is a plan, showing the same.

Figure 3 represents, in section, one of my improved pipes. Figure 4 represents an end view of' the pipe, and its seamless flange. (Look inthe direction indicated by the arrow, R,fig. 3.)

Figm'e 5 is a longitudinal section, through my im'- provcd core, showing the core-head K, and the corespindle L.-

Figure 6 is a longitudinal section, through my improved oore, showing the same as slightly modified, as will be explained.

Figure 7 is an end view of vmy improved core-head and spindle.

Figure 8 represents one of the cones, F, which serves to make the holes H H H H, ligs. 3 and 4, in the flange ofthe pipe.

To mould my improved pipe, it is necessary to have a flask core-spindle, and core, made for the"special purpose, as follows:

The flaskis made, as represented in fig. 1, in part or entire, of iron. One end of the flask A, for instance, is made of iron, and basa semicircular opening cut in each half, as shown in fig. 1, so that when the two parts, A and B, are put together, there remains a circular opening, in which the core-head K rests. Y

The opposite end of the flask has a similar circular opening, V, fig. 2, in which one end of' the core-spindle rests. The other end of the core-spindle passes through the core-head -K, iig. 5, and is secured to it by the pin D.

lIn the drawings, the pipe is represented as having but one ilanged end, but iu-practice itwould usually have both ends flanged, in which case there would be a core-head, K, at each end ofthe spindle L.

The pins F F F, gs..1 and-2, are made of coresand, and have spirals moulded upon them, as shown in fig. 8.

rlhese pins pass through the core-head K, as shown in figs. 5 and 6, and project beyond the face of it a distance equal to the thickness of the flanges to be cast, and being tapering, cause holes to remain in the casting, as shown at H H, figs. 3 and 4. These holes are largest at the face of the flange, as shown in iig. 3.

The holes in the core-head, through which the corepins F F pass, are made with spiral grooves, so that the core-pins F F are, as it were, screwed in, so that the hot met-al will not force t-hem from their places. l

Figs. 5 and 7.1'epresent a small pin, t, projecting fiom the lower part of the flask A into a socket, s, made in the core-head K. The object of this pin and socket is to keep the core securely inA position; also to hold the pattern in position while being moulded, so that the core-pins F F F F .shall come in the centre of the bosses when cast.

The core-spindle L is provided with the usual vents, not shown in the drawings.

f The sand-core M M, iig. 5, is formed upon the spindle `in the usual manner.

Inspection of lig. 5 will show thatthe bore of the pipe will be cast upon sand, but that the face of the flange will be formed against the ironcore-head'K. This will give it a slight chill, but will securefor the flange a smooth and perfectly true face.

In case a chill in the face of the flange should be objectionable, the iron core-head K may be made as shown in g. 6, and the sand-core be carried up the v face of the core-head, as shown by M M', fig. 6-.

A pipe, or column, cast upon a core, made as shown in fig. 6, will have the face of its flange as true, but

not quite as smooth, as though it were cast upon the `eifeets of any 'shrugging ofthe flask or pattern.

core, represented in fig. 5.k In either case the face of the flange will be without seams, and free from the The back of the flange is made with several bosses, O O 0 O, tigs. 2 and 4, corresponding in number with the lholes to be malle through the ilange. The segments of the ange, between the bosses, are thinned down to the shapelindieated in gs. .2 and 4. The object in forming the Ltlange thus, is to prevent it from being injured by shrinking in cooling, to give Ygoed seats for the bolt-heads, and give greater strength for the same weight of iron.

The holes through the lange being, of necessity, all alike, and equally spaced, the pipes, as they come from the sand, will accurately fit each other, and are ready to be bolted together.

The holes being tapering, Wit-h the small end at the back of the flange, may be so made thatthe bolts will l fit accurately, and yet admit of one of the pipes to be Y turned somewhat out of place.

The object of lny invent-ion is to producea pipe with true and -slnooth flanges, free from shruggage and cracks, having accurately-spaced bolt-holes, directly from the sand, thus avoiding any xnaehine-work on the pipe, its expense and liability of bad Workmanship.

fl/'hat I claim as my invention, ancldesi're to secure by Letters Patent, is-

l. The combination of the core-head K, the eorespindle L, and the ask A B, as speeiiied.

2. The tapering-threzuled cores F F F F, in combination with core-head K, as specified.

JACOB EDSON.

Witnesses:

WILLIAM EDSON, FRANK G. PARKER. 

